.header_container{
    width: 100%;
    height: 78px;
    background: #fff;
    box-shadow: 0px 3px 5px #CCC;
}
.header-top{
    width: 100%;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-bottom: 1px solid #ddd;
}
.header_logo h3{
    font-size: 22px;
    font-weight: 600;
    color: #0084ff;
}
.header_nav ul{
    display: flex;
    margin-left: 50px;
}
.header_nav ul li.header_nav_active{
    border-bottom: 2px solid #0084ff;
}
.header_nav ul li{
    margin: 0 15px;
    line-height: 50px;
}
.header_nav ul li a{
    font-size: 15px;
    color: #8590a6;
    font-weight: 600;
    text-decoration: none;
}
.header_search{
    position: relative;
    margin-left: 20px;
}
.header_search input{
    color: #8590a6;
    font-size: 13px;
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
    background: #f6f6f6;
    width: 220px;
    height: 28px;
    border: none;
    padding: 0 15px;
    box-sizing: border-box;
    border-radius: 3px;
    outline: none;
    transition: all .5s ease;
}
.header_search input:focus{
    width: 260px;
}
.header_search label{
    position: absolute;
    top: 0;
    right: 5px;
    line-height: 28px;
    font-size: 16px;
    font-weight: 600;
    color: #888;
}
.header_btn{
    margin-left: 20px;
}
.header_btn input{
    padding: 0 15px;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 600;
    background: #0084ff;
    border: none;
    line-height: 28px;
    font-size: 12px;
    border-radius: 3px;
}
.header_prompt{
    margin-left: 50px;
}
.header_prompt span{
    font-size: 22px;
    color: #8a8a8a;
}

.header_user{
    margin-left: 50px;
    font-size: 14px;
    color: #888;
}
.header_user p a{
    font-weight: 600;
}

.header-topic ul{
    display: flex;
    width: 100%;
    height: 28px;
    justify-content: center;
    align-items: center;
}
.header-topic ul li{
    margin: 0 20px;
    padding: 0 10px;
    box-sizing: border-box;
}
.header-topic ul li a{
    font-size: 13px;
    color: #666;
}